Yamaha Portatone PSR-640 Owner's Manual page 60

Digital Effects
Applying the equalizer
1
Press the [MASTER EQ] button.
This applies the equalizer effect to the entire sound of the instrument.
Listen to the difference in the sound by playing back the auto accompaniment,
demo, and songs.
2
To cancel the equalizer effect, press the [MASTER EQ] button
again.
Selecting a Master EQ type
1 3
-
Use the same operation as in "Reverb" (page 50).
4
Select "EQ Type Load."
Use the data dial, the [+/YES] button or the [-/NO] button.
5
Press the [NEXT] button.
BACK
6
Select a master EQ type.
Use the data dial, the [+/YES] button or the [-/NO] button.
For a list of the equalizer types, see page 59.
7
Press the [NEXT] button.
8
Press the [+/YES] button to actually enable the equalization
settings of the selected type.
Press the [-/NO] button to abort the operation.
60
NEXT